ox-texinfo: Put Texinfo output into `compilation-mode'

* lisp/ox-texinfo.el (org-texinfo-compile): Put Texinfo output into
  `compilation-mode'.

Suggested-by: Vaidheeswaran C <vaidheeswaran.chinnaraju@gmail.com>
<http://permalink.gmane.org/gmane.emacs.orgmode/97961>

lisp/ox-texinfo.el

@@ -1593,6 +1593,7 @@ Return INFO file name or an error if it couldn't be produced."
       ;; before applying it.  Output is redirected to "*Org INFO
       ;; Texinfo Output*" buffer.
       (let ((outbuf (get-buffer-create "*Org INFO Texinfo Output*")))
+	(with-current-buffer outbuf (compilation-mode))
 	(dolist (command org-texinfo-info-process)
 	  (shell-command
 	   (replace-regexp-in-string